Bolt and nut fixture



Patented Nov. 28, l`195() UNITED STATES PATENT OFFICE BOLT AND NUTFIXTURE Richard T. Reese, North Hollywood, Calif.

Application January 27, 1947, Serial N0. 724,635

3 Claims.

My invention relates to means for holding parts in place, particularlywhen subjected to intense vibration.

The diiTlculty of maintaining tightened parts secured by nuts and boltsin airplanes, for example, is well known, use being generally made ofcastellated nuts and cotter pins, since otherwise the nuts are verylikely to slack back under the combined elects of tension and vibration.

An object of the invention is to provide a construction of threadedconnection between a part and a member into which it is threaded, whichwill remain tight under conditions which would loosen such constructionshitherto in use.

It is a further object of the invention to provide a threaded connectionwhich is simple and inexpensive to produce.

Another object of my invention is to produce a threaded connection whichholds the connected parts more firmly together as any axially appliedforce tending to separate the connected parts is increased.

A further object of the invention is to provide a threaded connectionwhich is made up with the parts initially angularly disposed, butenabling them to be axially aligned when the connection is made afterwhich the connection cannot become loose by the action of forces actingaxially on the connection.

Still further objects and features of the invention will hereinafterappear in the following specication taken in conjunction with theaccompanying drawings, illustrating preferred forms of my invention.

In the drawings:

Fig. 1 is a side elevation partly in section showing a form of theinvention including a single threaded ball and sleeve operativelyconnected; and Fig. 2 is a side elevation partly in section of a modiedform of the invention showing threaded ball members attached to oppositeends of a common sleeve.

In Fig. 1 of the drawing, the threaded members I0 and II are arranged toprovide a ball and socket connection which will securely retain theparts against axial displacement while permitting them to moverelatively to one another.

The part I0 is furnished with a spheroidal head I2 on which is cut athread I 3 which is tapered rearwardly in diameter from the equatorialregion because of the spherical contour of the head.

The member Il is chambered and has an inwardly extending annular flangeI4 which is threaded to mate with the threads on the ball I2. The ballI2 is screwed into member II until the threads thereon pass inwardlyfree of the threads in ange I4, after which an axial pull on the memberscannot cause separation of the parts even under conditions of extremevibration if the axes of the members are at an angle to one anothersince the threads on the members cannot be matched.

In the form of the invention shown in Fig. 2, two ball headed membersIlla and Ib are shown engaged in a sleeve Ila provided at each end withan inwardly projecting flange Ma.

The ball ends of members I Ua and Ib are screw threaded, the axis of thescrew thread being oblique to the longitudinal axis of the members ita,I 6b.

A screw thread meshing with the thread on the ball ends is cut in theinwardly projecting flanges and the ball ends may be screwed into thesleeve by rotating the ends of the members in a circle about the ballend until the threads on the ball ends pass inwardly beyond the threadedrim. If an axial pull in opposite directions is applied to the sleeveand either member, the threads on the ball end will be positivelyprevented from engaging the thread in the rim so that there is no dangerof the connection slacking back under the combined elects of tension andvibration.

While I have particularly described and illustrated various forms of thethreaded connection of my invention, it is to be understood that changesor modifications of parts may be made by those skilled in the artwithout departing from the scope of the invention as intended to bedened by the appended claims.

I claim:

l. A threaded connection including: a first part provided with aspheroidal screw threaded part; a sleeve provided with a recess and aninternally threaded annular flange at the end thereof adapted to meshwith the screw thread of said first part, the screw threads on the partsbeing arranged so that they are initially in mesh when the parts arescrewed together during the initial movement of the spheroidal part intothe sleeve, but pass out of mesh on further movement of the spheroidalpart into the sleeve, though in abutment with each other to preventdisplacement of the parts by an axially applied force.

2. A threaded connection as set forth in claim 1 and in which the threadon said spheroidal part is formed helically on a diametrical axisinclined from the common longitudinal axis of the iirst part andspheroidal head carried thereby.

3. A threaded connection as set forth in claim 1 and in which the threadon said spheroidal part is formed helically on a diametrical axisinclined from the common longitudinal axis of the rst part andspheroidal head carried thereby, the construction assuring that when theparts are in fully engaged relation, an axially applied force will holdthe threads on the parts against assuming a position in which relativerotation of the parts could cause meshing of the threads.

RICHARD T. REESE.

REFERENCES CITED The following references are of record in the file ofthis patent:

Number Number 4 UNITED STATES PATENTS Name Date Carleton May 8, 1883Ryan May 13, 1913 Thompson Jan. 20, 1925 Dardelet Jan. 24, 1928 HopeApr. 25, 1933 Unke June 10, 1941 FOREIGN PATENTS rCountry Date FranceJune 2'7, 1905 France Dec. 21, 1923 Switzerland Aug. 2, 1943

